Rewrite fast/multicol/table-margin-collapse.html as a reftest.

LayoutTests/platform/win/fast/multicol/table-margin-collapse-expected.txt

Index: LayoutTests/platform/win/fast/multicol/table-margin-collapse-expected.txt
diff --git a/LayoutTests/platform/win/fast/multicol/table-margin-collapse-expected.txt b/LayoutTests/platform/win/fast/multicol/table-margin-collapse-expected.txt
deleted file mode 100644
index 3874a57a01815e9f242bc56d822c7b7a5ee4a576..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/win/fast/multicol/table-margin-collapse-expected.txt
+++ /dev/null
@@ -1,22 +0,0 @@
-layer at (0,0) size 800x600
-  RenderView at (0,0) size 800x600
-layer at (0,0) size 800x600
-  RenderBlock {HTML} at (0,0) size 800x600
-    RenderBody {BODY} at (8,8) size 784x584
-      RenderBlock (anonymous) at (0,0) size 784x36
-        RenderText {#text} at (0,0) size 742x35
-          text run at (0,0) width 447: "The four rectangles below should both be at the top of their columns. "
-          text run at (446,0) width 296: "If one is lower than the other, than the test has"
-          text run at (0,18) width 45: "failed. "
-          text run at (44,18) width 412: "The pattern in each column should be the same (orange/yellow)."
-layer at (8,44) size 784x304
-  RenderBlock {DIV} at (0,36) size 784x304 [border: (2px solid #000000)]
-    LayoutTable {TABLE} at (2,2) size 382x500
-      LayoutTableSection {TBODY} at (0,0) size 382x500
-        LayoutTableRow {TR} at (0,0) size 382x500
-          LayoutTableCell {TD} at (0,0) size 191x500 [r=0 c=0 rs=1 cs=1]
-            RenderBlock {DIV} at (0,0) size 191x200 [bgcolor=#FFA500]
-            RenderBlock {DIV} at (0,300) size 191x200 [bgcolor=#FFA500]
-          LayoutTableCell {TD} at (191,0) size 191x500 [r=0 c=1 rs=1 cs=1]
-            RenderBlock {DIV} at (0,0) size 191x200 [bgcolor=#FFFF00]
-            RenderBlock {DIV} at (0,300) size 191x200 [bgcolor=#FFFF00]